html,body{
    margin: 0;
    padding: 0;
    font-size: 4vw;  /*一行中的一个字是一行的4%的宽度*/


}

/***************全部容器部分*****************/
.container {
    display: flex;/*弹性布局*/
    /*justify-content: center;/*主轴上的对齐方式*/
    flex-direction: column; /*垂直排布*/
    height: 100vh;/*高度占比100%*/
}
/**********************顶部用户信息部分*****************/
.head-img{
    position: relative;
}
.head-img img{
    width: 3em;
    height: 3em;

    border-radius: 50%;
    display: block;
    border: 1px solid #717171;

    margin-right: 10px;
}
.head{
    display: flex;
    align-items:center;
    margin: 20px 10px 40px 25px;
}
.letter{
    margin-left: auto; /**********************让图标靠右*****************/
    margin-right: 20px;
}
.i.material-symbols\:mail-outline{
    font-size: 30px;
}
.id {
    font-size: 25px;
    margin-bottom: 0.6em;
    font-weight: bold;
}
.mentor {
    font-size: 2.4vw;
    background-color: whitesmoke;
    color: #717160;
    padding: 0 0.2vw;
    border-radius: 4px;
}
.red-point {
    width: 2vw;
    height: 2vw;
    border-radius: 50%;
    background-color: red;

    position: absolute;
    left: 10vw;
    top: 0.8vw;
}
/**********************主要功能部分*****************/
.choose{
    display: flex;
    justify-content: space-around;
    border-bottom: solid 1px #DDD; /*在底下加上一条边*/
}
.choose-item{
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}
.choose-item span{
    font-size: 3vw;
    display: flex;
    margin-top: 10px;
    margin-bottom: 40px;
}
.choose-item img {
    height: 4em;
    width: 4em;
}
/**********************底部会议部分*****************/
.previous {
    font-size: 3vw;
    background-color: whitesmoke;
    color: #717160;
    border-radius: 4px;
    width: 120px;
    height: 30px;

    margin-right: 30px;
    margin-top: 30px;

    display: flex;
    justify-content: center;
    margin-left: auto;
    align-items: center;
}
.nothing{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}
.nothing img{
    height: 8em;
    width: 7em;
}
.nothing span{
    font-size: 4vw;
    margin-top: 50px;
    color: #717171;
}